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首页> 外文期刊>African Journal of Food, Agriculture, Nutrition and Development >Geophagia clay soil as a source of mineral nutrients and toxicants
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Geophagia clay soil as a source of mineral nutrients and toxicants

机译：土生土作为矿物质营养和有毒物质的来源

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Geophagia, which involves ingestion of non-food lithospheric substances, is the major form of pica in many African cultures. A common lithospheric pica substance ingested in the Cape Three Point region of West Africa, particularly Ghana and Togo, is a white loamy clay soil. This clay soil is usually ingested by women of reproductive age. Some of the reasons assigned to clay geophagia include appealing flavour, to alleviate nausea during pregnancy, and for absorption of toxins in the gastrointestinaltract. Some speculation indicates that geophagia may be an attempt to replenish mineral nutrients in undernourished persons. The study of the acid extractable mineral contents of this white clay soil was done to provide information on the mineral contents that could potentially be absorbed in the gastrointestinal tract. Results showed that the clay soil was very dry with mean moisture content of 0.19±0.01%. On dry weight basis, the geophagia clay soil contained (mg/100 g) aluminium, 1,239.6; iron, 962.9; lead, 2.4; magnesium, 64.3; and zinc, 54.6. The extractablemineral contents of this clay soil, on dry weight basis, were (mg/100 g): zinc, 1.40±0.05; iron, 14.19±0.13; magnesium, 23.83±0.31; and aluminium, 37.91±2.94. Compared to the total minerals contents of the clay soil, the acid extractable fractions represented 2.6% of zinc, 1.5% of iron, 36.4% of magnesium, and 3.2% of aluminium. Even though lead was not detected in the acid extracts, a small amount was detected in the dry clay soil. Arsenic was not detected in any clay sample or extracts. It was concluded that the main mineral nutrient potentially contributed bythis clay pica substance was iron. The clay soil liberated a substantial amount of iron (14.2 mg/100g), which constituted 78.9% of the 18 mg/d iron RDA for women of reproductive age and 53.0% of the 27 mg/day iron RDA for pregnant women. The potentially undesirable effect of ingesting this clay soil is the high level of aluminium (37.9 mg/100g).
机译：吞噬涉及非食物性岩石圈物质的摄入，是非洲许多文化中异食癖的主要形式。在西非三角角地区（尤其是加纳和多哥）摄取的一种岩石圈皮卡皮卡物质是白色壤土。这种粘土通常是育龄妇女摄取的。黏土噬菌体的一些原因包括诱人的风味，减轻怀孕期间的恶心以及消化道中毒素的吸收。一些推测表明，吞咽障碍可能是为营养不良的人补充矿物质营养的一种尝试。对这种白色粘土的酸可提取矿物质含量进行了研究，以提供有关可能在胃肠道中吸收的矿物质含量的信息。结果表明，粘土非常干燥，平均含水量为0.19±0.01％。以干重计，土相粘土含有（mg / 100 g）的铝1,239.6;铁962.9;铅2.4;镁64.3;和锌，54.6。以干重计，该粘土的可提取矿物质含量为（mg / 100g）：锌，1.40±0.05;和铁，14.19±0.13;镁，23.83±0.31;和铝，37.91±2.94。与粘土土壤中的总矿物质含量相比，可酸萃取的部分占锌的2.6％，铁的1.5％，镁的36.4％和铝的3.2％。即使在酸提取物中未检测到铅，在干燥的粘土中也检测到少量铅。在任何粘土样品或提取物中均未检测到砷。得出的结论是，这种粘土云母物质可能贡献的主要矿物质营养素是铁。粘土释放出大量的铁（14.2 mg / 100g），对于育龄妇女而言，铁的含量为18 mg / d RDA的78.9％，对孕妇而言为27 mg / d的铁RDA的53.0％。摄入这种黏土的潜在不良影响是铝含量很高（37.9 mg / 100g）。

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